Herbert Schmidt Model 21S .22LR 6shot Revolver

Ever heard of this? I've got a Herbert Schmidt Model 21S .22LR 6shot Revolver w/5½" barrel blued w/ wood grips. It says it's made in Germany. I can't seem to find anything about it on the internet, so I thought I'd go right to the experts. Anything you know about it is more than I know about it!
Thanks,
Huck